解析：Given that x ≠ y and that (x - y) 2_考试试题_GRE

【单选题】Given that x ≠ y and that (x - y)² = (x + y)², which of the following must be true
Ⅰ.x+y=x-y
Ⅱ.y = 0
Ⅲ. xy = 0
A、None
B、Ⅱ only
C、Ⅲ only
D、Ⅰ and Ⅲ
E、Ⅰ, Ⅱ, and Ⅲ
网考网参考答案：C
网考网解析：
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